One-Many bidir: moving elements by setting collection fails

[andyjefferson]

Moving a collection element fails for One-Many bidir when it is done by setting a collection (containing that element) on a new owner. This is the case both for FKSetStore and JoinSetStore. Reproducible using ManagedRelationshipTest.testOneToManyJoinBidirSetCollectionMoveElement() and testOneToManyFKBidirSetCollectionMoveElement().